Exam 20: Genes Within Populations

Select the phrases that can be associated with intersexual selection

In some instances environmental change causes a situation where one phenotype is favored for a period of time,and then a different phenotype is favored.This oscillating selection causes

Animals that select mates that are phenotypically similar will have ________ when compared with Hardy-Weinberg predictions.

There are more than 30 blood group genes in humans,in addition to the ABO locus.This increases ________ in human populations.

You spray your kitchen with an insecticide to kill the cockroaches.A few survive and reproduce,producing a large healthy population in a few generations that all have similar genetic backgrounds.This is an example of ________

The key point in Darwin's proposal is that the ________ imposes the conditions that determine the direction of selection.

A population of lizards lives in a rocky area next to a desert.Some lizards are light colored and blend into the sand.Others are dark and blend into the rocks.What may happen to this population of lizards over time?

The presence of the disease sickle cell anemia illustrates that natural selection does not always eliminate ________ alleles.

Investigate sexual selection by completing the sentences.

A population of flowers is in Hardy-Weinberg equilibrium with an allele frequency for white flowers (w)of 40%.What percentage of the flowers will have the colored or dominant phenotype?

Investigate the effects of the costs of reproduction by completing the sentences.

An insect population that becomes resistant to a commonly used insecticide is an example of ________.

Moths that can evade a bat's echolocation have ________ that increase their likelihood of survival and reproduction.

By evaluating and selecting mates with superior qualities,an animal can increase its

The percentage of different colored water boatmen eaten by fish were graphed relative to the frequency of that color in the population.Based on the graph,a population of water boatmen would ________

Being born with extra fingers on a hand is called polydactyly.This is more common in some populations in North America than others due to ________.

In the graph above,how can the change in infant mortality be explained as birth weight increases from 2 to 7 pounds?

About 80% of the alleles present in thoroughbred horses can be dated back to 31 known ancestors from the late eighteenth century.As a result,one would expect ________

In early ancestors of the modern giraffe,longer necks allowed animals to reach higher tree branches as food.This would lead to ________ in the ancestral giraffe population.

Cheetahs have been through a genetic bottleneck; evidence for this is that